Concrete arch-bridge.



C. A. P. TURNER.

CONCRETE ARCH BRIDGE.

APRLIOATION FILED 001228, 190s.

1,002,944, Patented sept. 12,1911.

PATENT @FETCH CONCRETE ARCH-BRIDGE.

Specification of Letters Iatent.

Patented Sept. 12, mi t.

appiicaneiieid @grober ce, isos. sensi No. 459,955.

To fill 'who/m, it may concern:

lic it known that l, CLAUDE P. TURNnn,

oi" VMinneapolis, in the county of i'ienncpin and in the citate oi" Minnesota, have invented a certain new and nscit'ul improvement in oncreteArch-Bridges, and do hereby de Clare that the following is a full, clear, and cxactl description thereof, reference being had to the accompanying drawings, in which l Figure i is a View partly in ,side elevation and partly in section; ot a concrete bridge is rnctcd in accordance with my intein' tion; lrin. Q i. horii'ontal section on the lino oit Fig. i; Fig. l a cross section on the lines ie-S of Fig. l, the sections being` taken riiii'ereirt poins longitudinally ot the i: fi a detail View ot a portion of n `Ti the iain ribs-viewed in a piane. tan- Y 'el and ci the Lateralv struts or braces; and Fig. a detail View in cross section on thc line 5-5 of Fig. 4, showing the manner ot supporting the centering from the rib reinforcement.

The objects ot my invention, generaliy stated, are to enable the construction ot' reinforced concrete arch structures, such as bri. ges, without connecting the floor and the ribs throughout their length as has been the practice heretofore, whereby the lateral stresses are carried-by the fioor, and to enable the rib Ientering to he supported in a more economical manner than by the methods or eriiiedients hitherto employed, and for the .attainment oi these objects, as well as others which will hereinafter appear, my invention consists in the reinforced concrete arch constrncted substantially as hereinafter specified and claimed.

The bridge which l illustrate in the dran'- ings as exhibiting an en'ihodiniei'it of my in rtmtion, one which i designed in which the span of the arch is three hundred and titty itcet. and it comprises three main ribs springing from abntments B. and a liat tioor C consisting of a slab extending,l from abutment to abiainent, and touching the ribs or arches only at their iniili'il'c portions, rertiral struts l() rising; at suitable intervals troni the ext? .los` ot the ribs to tho tioor stat, such struts being` ot suitably reinforced concrete..

rherili rei 'itorccnient consists of a lattice box il and encircling: the latter is a series ot ionggittulinaiiy cxtendii'ig' rods i2 which in turn are encircled or inclosedby. rings or bands t3, so that the ribs are ot hooped rc- `inforced concrete, the rings or bands being secured vtogether in any ot the usual ways.

I use the lattice box reinforcement for the ribs because it is Well. adapted for supporting` the centering ll, one oit the objects of my invention being` to support the centering from the rib reinforcement instead of snpporting the centering in the. customary man- ,65

ner, for by supporting the centering from the rib reinforcement I reduce thc cost of construction. The lattice box reinforce ment may be erected from abutment to 'abutment, and suitably braced, or sustained by temporary supports, orit 11i-ay be trussed at suitable intervals. f

The ribs at points intermediate their contrai portions and the abutments arc braced or supported-for lateral strains by struts l5,

preferably of reinforced concrete, that eX- tend horizontally from rib to rib atv right angles thereto and obiiquely, or at an incline, and are secured or anchored to the ribs by having the strut-reinforcing rods em- 8o bedded at their ends in the ribs. Between the floor and the ribs from the point toward thecenter where the trusses formed by the members 15 begin and inward from such inner limit of tbetrusses, brackets or diaphraginbrac'es 16' (seeFig. 3) connect the tloor and ribs. An important result of the, connection between the floor and ribs at the .crown ofthe arch is that it reduces the eX- tent of the lateral trusses that are required between the ribs.

Having thus described my invention, what I claim isy1. In a concrete arch construction, the

cmnbination of reinforced concrete, spaced,

arclr'torm ribs, a reinforced ll oor slab in tegral with the ribs at the central portion ot' the span, and a lateral system ot' trusses composed of' members of reinforced concrete extending' between tho ,ribs at right anglesand, 10U

obliqucly thereto, said system being situated intern'iediatc said integral central portion or' the structure and thc abutnicnts.

2. In a concrete arch construction, the

eonibimitionot reinforced concrete, spaced,

arch-form ribs, a reinforced floor1` slab integral with the ribs at the central portion ot the span, and a lateral system of trusses composed of members ot reinforced concrete cxtending between the ribs at right angles and obliquely thereto, said system being situated intermediate said integral central portion of" the structure iidf'tne abutments, alridliia.-` phragm braces.connecting the floor slab and the ribs ata .point inward from said system.

\ of trusses toward `the 4'center of the s an.

. forcement,` longitudinally' extending ribs distributed around said lattice box reinforce#y ment, and hoops encircling said ribs.

4.1m a concrete arch construction, thel combination. of larch-form lattice box' rein- Qopies of this patent may b'e obtained for five cents each, byeddressing the` Comxhissioner ot Patents.

` Washington, D. 0.,

: forcement,longitudinally'extending ribs distributed around said lattice box reinforcement,ho ops encircling said ribs, and centering'for casting the concrete supported di- 3. In fa; concrete arch construction, the combination of arch-form lattice boxrein rectly. from the lattcebox reinforcement. In testimrny that I claim' the foregoing I have heren v CLAUDE A; P. TURNER. Witnesse s: v H. S. PETEBSEN, D. B; FnGLEs.

to setn-iy hand. l 

